Patrick Jordan-Smith wrote:
Best practice in DNS is to run separate recursive and authoritative dns servers. It's referenced in some rfc somewhere I believe.
RFC 5358/BCP-140.
Scripting something to check the whois every night for the domains you host and removing ones that are no-longer pointing at your dns servers is also a good idea (saves doing it by hand.)
Perhaps checking authoritativeness against the DNS servers for the TLD would be more appropriate rather than pounding whois ;). As a minor point to Thomas' original question, could the propogation issues in NZ you see be related to the fact that your domains are primarily used by New Zealanders, thus are more likely to be cached in local recursive nameservers, vs. not being cached by overseas nameservers. This would account for the delay you see, while you wait for domestic servers to reach TTL expiry. How long is your TTL? Thought about reducing it? aj